have objects moving through the rectangular field of play, each one starting at one wall and ending at onether, going along a straight line in a random vector at a constant but randomly chosen speed. while they're doing this, your job is to 'toss' something all the way from the bottom side of the rectangle to the top, without it hitting anything, to 'toss' it you hold the mouse button and thrust the mouse and hwen you release the button the object shoots off at the velocity at which your mouse moving hwen you released the button, velocity is determined simply by the difference between the current X,Y position and the X,Y position N seconds ago, where N is a very small fraction of a second.